The 2005 STI has a few bumper upgrades. I understand that the Forza bumpers are pretty much the only adjustable ones and I agree with that. However, the Forza rally style bumper(Race front bumper) for this car is the only one that allows you to adjust the downforce and not the Forza bumper with the big splitter and canards(Street front bumper). This is kinda ridiculous as it was a problem in the previous Horizons. They should at least both allow you to adjust downforce.
SPLITTERS AND CANARDS ARE WHAT YOU ADD TO A CAR TO ADJUST(ADD) DOWNFORCE